[Bug bootstrap/116165] New: thin archive support in gcc/Makefile.in uses T rather than --thin

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116165

            Bug ID: 116165
           Summary: thin archive support in gcc/Makefile.in uses T rather
                    than --thin
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Keywords: internal-improvement
          Severity: enhancement
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

In https://sourceware.org/binutils/docs/binutils/ar-cmdline.html , it is
mentioned that T is an deprecated alias option for thin archives and that
--thin should be used instead.

‘T’
Deprecated alias for --thin. T is not recommended because in many ar
implementations T has a different meaning, as specified by X/Open System
Interface.

We should convert over to use --thin instead.